INDEX 



The superior figures tell the exact place on the page in ninths ; e. g. 87* 

 means page 87 beginning in the third ninth of the page, i. ©. about one third 

 of the way down. 



Adams, F. D., cited, 19'. 



Adirondacks, comparison with north- 

 em, 64^-65'. 



Anthracite, 26". 



Apatite, 87', 88\ 88», 90^, 91S 92*, 92«. 



Aplite, 82». 



Augen syenite, 89». 



Augite, 88S 89*, 90^, 90^ 91S 91^ 91% 

 92\ 



Beekmantown formation, 1(F, 25'- 

 29S 52»-55«, 56'-58» ; best exposures, 

 25", 28=^; slope of the surface on 

 which deposited, 60'-62»; thick- 

 ness, 27«, 57S 60^-61^ ; use as build- 

 ing stone, 81®. 



Biotite, 15^ 18», 20», 21», 22S 23», 84% 

 86% 86% 87% 87^, 89^, 89% 90^, 90% 

 90% 92% 92«. 



Birdseye limestone, see Lowville 

 limestone. 



Black creek, 80% 



Black river limestone, 10"; thick- 

 ness, 50% 



Brigham, A. P., cited, 73% 77^, 78% 

 80^. 



Bronzite, 88% 89% 90*, 90% 



Building stone, 81'-82*. 



Calcif erous formation, see Beekman- 

 town formation. 



Calcite, 26% 28% 29». 



Chalcopyrite, 27^. 



Chamberlin, T. C, cited, 73% 78% 



Chazy formation, 27*; absence in 

 Mohawk valley, 63% 



Chert, 26% 28^ 



j Clarke, J. M., cited, 25% 33% 

 Clays, 83' ; laminated, 75«-77\ 

 Conglomerate, 28% 

 Cumings, E. R., cited, 25% 



Darton, N. H., cited, 25% 28% 38% 39*, 



42% 44% 57% 62% 

 Deformation period, 12*. 

 Diabase, use for road metal, 82% 

 Diabase dike, 17% 

 Diamond hill, 26% 57% 

 Dikes, 12% 

 Dip, 35«-36% 



Dolgeville fault, 13% 38% 43»-4P. 

 Dolomite, 26% 

 Drainage, 77^-81% 



Economic geology, 81% 85% 



Faults, 38*-47*; how produced, 12«; 



Dolgeville, 13^ Little Falls, 13'; 



influence on topography, 71^-73% 

 Feldspar, 15% 16% 18», 21% 22», 23», 



24% 86% 87% 87% 88% 88% 89^, 90% 



91% 92% 

 Folds, 37^-38% 

 Foliation,. 6% 47'-48% 



Gabbros, 89% 



Galena, 27=*. 



Garnets, 18», 22% 86% 86% 87», 87% 

 88% 89% 



Geographic position, 4% 



Geology, general, 4»-15% 

 j Glacial deposits, 73^-81% 

 I Glacial period, 14*. 



Glauconite, 27^, 27% 



